Venus's Atmosphere Has Much More Carbon Dioxide Than That of Earth

Q30: Astronomers estimate that our galaxy contains _

Q31: Mars is named for the Roman god

Q32: _ is the planet that is most

Q33: The Moon and Mercury lack _.<br>A) a

Q34: Like most stars the sun is made

Q36: The sun, its eight planets and their

Q37: Comets are small solid bodies of rock

Q38: The absence of fold mountains and the

Q39: The moon formed from debris blasted out

Q40: As meteors enter the Earth's atmosphere, large